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List m passes through the points ( -4,3) and (-4,7). What is the slope of the line that is perpendicular to line m ?

User Xbito
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1 Answer

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Check the picture below.

notice, this line, in black, is really just a vertical line, namely x = -4.

a perpendicular line to that, like the red line there, will be a horizontal line y = [some number].

recall a vertical line always has an undefined slope, whilst a horizontal line always has a slope of 0.

List m passes through the points ( -4,3) and (-4,7). What is the slope of the line-example-1
User Darren Kopp
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